Re: FAA owns above 400 feet?
The 400ft rule applies to a lot of technical stuff, however when it comes to crime & violence such as piracy or shooting at FAA registered craft, the law defines the special aircraft jurisdiction of the United States.
Through this provision the FAA could claim "special aircraft jurisdiction of the United States" for all registered drones anywhere in the world (or a foreign owned drone whose flightpath lands in the US and certain other cases) for the period starting upon completion of "preflight preparation of an aircraft by ground personnel or by the crew for a specific flight until 24 hours after any landing".
So, no matter where you are in the world, think twice about shooting a drone or assaulting it's crew. If it's registered with the FAA you'd be committing a Federal crime and could look forward to some extraordinary rendition fun!